Replacement casement crank hardware set.

A home owner from Farmington, NM says:
Hello,
Can you please help me identify a replacement for hardware shown in photo attached? I believe the stamp says 1.H. I.R. The arm length is 9 inches and the bolt holes are 4" on center.
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Dave Sr. from SWISCO responded:

I believe the closest operator we have that's to yours is our 39-002 . Check to see our dimensions line up to yours. 

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